Suction pipe



FIG. 1 is a left side perspective view of a suction pipe in accordance with the new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines shown in FIGS. 1-7 are for illustration purposes only and form no part of the claimed design. 

The ornamental design for a suction pipe, as shown and described. 